Israeli Prime Minister Benjamin Netanyahu and Russian President Vladimir Putin have agreed on a plan to avoid "misunderstandings" in Syria amid an apparent military build-up by Moscow to support President Bashar Assad.

The two leaders reached an agreement on Monday during talks in Russia, with Israeli media reporting that the discussions involved avoiding clashes between the two militaries' jets over Syria.

France opened a business development office in Tehran on Monday seeking to renew once-strong economic ties with Iran after the July 14 nuclear deal in the face of "fierce competition".

French Agriculture Minister Stephane Le Foll and Minister of State for Foreign Trade Matthias Fekl inaugurated the "Business France" office on a visit with some 150 business leaders that is to run until Wednesday.

Iran said Monday it independently collected samples at a suspect military site where illicit nuclear work is alleged to have occurred and later handed them to the U.N.'s absent inspectors.

The disclosure that international monitors were not physically present is likely to feed critics of a nuclear deal between Iran and world powers, who have poured scorn on measures used to check if Tehran's atomic program is peaceful.

The head of the U.N. nuclear watchdog will travel to Iran on Saturday for talks on Tehran's nuclear program with senior officials, the IAEA said in a statement.

The discussions between International Atomic Energy Agency chief Yukiya Amano and the "high-level" officials will take place on Sunday, it said, as a December deadline looms for completion of a long-running investigation into Iran's past nuclear activities.

U.S. President Barack Obama has stressed the importance of better intelligence cooperation between Washington and Tel Aviv to stop Hizbullah from obtaining more missiles with which to target Israel.

“As much intelligence cooperation and sharing as we’re already doing, we need to do better if we want to stop Hizbullah from continuing to get missiles that can be trained on Tel Aviv,” Obama told The Forward, a newspaper published in New York for a Jewish-American audience, in an interview.

President Barack Obama's administration vowed to press ahead with a half-billion-dollar mission to train Syrian opposition fighters Tuesday, despite fears that its initial failures have dented U.S. credibility.

After the routing of a 54-strong U.S.-trained force by al-Qaida allied rebels, Pentagon spokeswoman Commander Elissa Smith told Agence France Presse there was no plan to pause or scale back the program.